EDM-A Questions - Test B

what is the minimum clearance between the counbterweight and the counterweight gaurd?

20mm

holderwhat is the maximum bottom runby for counterweights

900 mm

which statement is most true for horizontally sliding landing door?

door retainers must be readily identifiable

a material construction hoist equipped with a broken roipe type safety will not be licensed unless a type test indicates that the safety will stop the car when it is free falling with its rated load?

true

the maximum allowable number of persons to be carried ina construction hoist is determined by?

multiplying the net inside area of the car by 5what is the p

urpose of the interior webbing of a hard har?

impact distribution quality

what class of fire extinguisher is effective against electrical, flammable liquid or rubbish fire?

ABC

what is the title of the CSA standard used in ontario to regulate the installation of lifts for the physically disabled when installed in public buildings?

CSA B355

Type ____ develop retarding forces during compression stroke of one or more oil buffers interposed between the lower members of the car frame and a governor operated auxillary safety plank applied on the guide rails.

C

ELongation rate is a measure of?

ductility

the elevator put is located between the sill level of the lowest landing the?

floor of the elevator hoistway

self drilling anchors, expansion anchors and inserts are all forms of?

rail bracket fasteners

the rated speed on a screw machine shoudl not exceed?

0.75 m/s

construction hoists for personnel are not required to have control devices that automatically govern the speed of the device if they are manually controlled?

truethe max

the maximum capacity allowable for a dumbwaiter is?

250 kg

which pf the following devices are not covered untder the TSSA safety act

frieght platforms on which passengers are prohibited with a rise of 2m or less

lines show as long dashes used to show the alternate location of a moveable part are called?

phantom

in a public building that has a handicapped elevating device, what must be posted at the entrance if the device if the device is not accessible?

a notice which sets out a procedure enabaling handicapped persons to access the device

whose responsibility is it to notify the director shoudl the following pccur: an incident involving potentially hazardous elevating device?

the owner and the maintaing contractor

what name is given to the joinin of two rope ends to form one continuous rope?

hitch

what type of bracket can support one main rail and two counterweight rails?

a combination main and counterweight bracket

what is the ultimate purpose of a elevator speed governor?

activate car safeties

what determines if rails need to be stored with alternate male and female ends out?

rail schedule

what is the maximum elevator speed allowed with spring buffers are used?

200 fpm

what are the vertical members of the car sling called?

stiles

what is the name of the steel plate that holds two sections of rail together?

fishplate

what do we call the first part of the car enclosure hoisted into the car sling?

dome

how should the safeties of a false car be set when moving up to a new work position?

manually held open

what connects the two end frames of a scaffold?

diagonal braces

what are necessary procedures when installing scaffold?

eveling, bracing, tying off

when ladders are used for ascending or dscending from one level to another:

extend ladder top at least three feet above landing serveda 6

a 6”x6” timber with a ten foot span, will safetly support 1380 lbs. what will it safetly support if the span was 20 feet?

690 lbs

when shoudl gloves not be worn?

when placing rollers under a load

what is the maximum clearance between the car platform sill and the hoistway sill edge of any landing sill on an an elevator?

32mm

the weight of the compensating sheave is applied to?

both car and counterweight

maxton, eeco, blain, beringer, gmc, martini are all types of?

hydro control valveshow

how does a standard diode act in a circuit?

as a one way valce

what is the length of the diagonal of a square whose sides are 75mm each?

106mm

a metric feeler gauge indicates a gap of 0.15mm. Give this dimension to the nearest one thousandath of an inch.

0.006 inches

what is a transistor?

a semiconducter device that is a switch and an amplifier

what is the primary function of a megger?

test insulation resistance

with oxy acetylene equipment, what device reduces pressure to proper operationg presure?

cylinder regulator

what should a metric torque wrench read in Nm if a data plate requires a torque of 15lbft?

66.7 Nm

a precision measuring sintrument which can be used for alighing shafts is a?

dial gauge

a torque is measured in units of?

ft lb in

in a worm gear reducer, the worm is made of?

steel

where does a biffer strike plate attach?

bottom of car or counterweight

the part of a hydraulic control valve, which is required to be sealed, is?

the relief valve

b44 code requires that hydraulic control valves for elevators be?

tested by the installing contractor

oil is kept from leaking out of a jack unit by the:

gland packing

an inductance is a property attributed to a:

coil

an ac voltmeter can be used to measure:

ac voltage

in a power cicrcuit, the overload relay is generally located?

the last device before feeding the motor

standed wire is used instead of solid because?

it is more flexible

in hydraulic elevators, single stage jack units are usually of the:

displacement type

of of the factors affecting hydraulic control valve performance is:

the oil temperature

if a hydraulic control valve has no pressure compensation, the down speed of an elevator will:

vary with the load of the elevator

submersible motors are used for:

hydraulic eleavator applications

what causes friction in a hydraulic system?

excessive line length, excessive velocity, excessive # of bends or fittings

a two stage jack must be:

internally guidied

precations in the use of a megger include:

discharging the circuit after measurments are completewhich

which term defines how many times per second a sine wave repeats?

frequency

a direct current DC circuit is characterized by the fact that the current carrying charges are flowing:

in one direction only

what function do the motor contactors servce on a hydraulic elevator?

to run the car in the up direction

what test is performed when checking for a leaking cylinder?

static load

a three stage jack must be?

internally and externally guided

the usually distribution system for “shop air is:

copper or plastic tubing

the NPT refers to threads for?

pipe National Pipe Tapered

the usually compressed air pressure of shop air is?

100 PSI

how is OHMs Law typically writen?

V=IR

the current flowing in an electrical circuit is directly proportional to the voltage and inversely proprotional to the resistance. This statement is?

ohms law

the study of magenets has shown us that?

like poles repel

the MG set in an elevator installation converts?

AC to DC

when smooth flow of fluid is disrupted, the fluid particles move in a random pattern called turbulent flow. Turbulent flow can be caused by?

high velocity, sharp bends in the pipe, large number of bends

pressure in a hydraulic system is created by?

resistance to flow

strainers are used in hydraulic systems to prevent oil contaminatiomn, they are mounted in the reservoir on the…

inlet of the pump

for passenger elevators the miniumum illumination at the car threshhold with the doors closed shall not be less then?

50 lx

in order to check the quality of motor insulation we use a?

megger

the minimum number of connection leads which may be found in an elevator dc hoist motor terminal box?

4

the usual speed ratio for 2 speed AC motors is?

1:2

a tachometer or encoder is usually used to measure what?

motor speed to the controller

the simpilist method of motor control for elevators is?

AC using vvvf inverter

the commutator of a DC machine is used to?

switch the armature current to different armature windings

a DC motor is usually supplied with sleeve bearings in order to?

provide quiet running

the rotating MMF wave in the AC machine stator, is formed by the action of?

three phase supply and distributuion of stator windings

if the shunt field excites of a DC motor is reduced, what happens?

the motor speed will increase

the conversion factor between KW and HP

0.746

name plates of EURO motors give the rated power in KW, this number represents?

the product of rated Volts amps

compounding refers to?

adjusting for the effective for lopp resistance using the series field

the material used for contacts of modern power relays?

silver cadmium oxide

it is suspected that there is electrical noise on a certain PCB signal, the instrument that will best show that is?

ocillisscope

when testing circuits to determine the value of any voltage present, always use a meter that is set for its?

highest range

what should be used to remove fuses?

a fuse puller

how may a mechanic best be protected when an older elevator does not have mainline lockout facilities?

clearly tag out

what is the first thing a mechanic does upon arrival at a modernization project?

contact the building rep

Silcon doped with boron atom is said to be?

P type silicone

a hopistway access switch is required at the top landing when the distance from the top of the car to the landing sill exceeds ________ when the car platform is level with the landing immiedtly below the top landing?

900 mm

governor rope shall be lubricated?

never

there are 2 families of transistors?

bipolar and field effect

what is the name of the number that goes on the car sling at the top?

registration number